The temperature of the surface of the object to be measured should not exceed
60
o
C, otherwise the probe will not be workable.
Dust, iron chips, and carbon particles will cause trouble; keep unit clean all the
time.
Grease, oil and dust will make the cable of the probe aged and cracked,
therefore, after the use, the cable should be cleaned of dust and dirt.
If the unit is not to be used for a long time, remove the batteries.
Strictly avoid any collision or damp environment, etc.
7
Table of sound velocity of various materials
Materials Sound velocity (m/s)
Aluminum
6260
Zinc
4170
Silver
3600
Gold
3240
Tin
3230
Steel
5900
Brass
4640
Copper
4700
SUS
5790
Propylene resin
2730
Water(20
o
C)
1480
Glycerine
1920
Water glass
2350
9
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